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Integer擴展數字,爲什麼我會在底部得到錯誤?整數擴展數字,但不能在<?用整數擴展Number>
interface Predicate<T> {
public abstract boolean check(T t);
}
Predicate<? extends Number> predUpper = null;
predUpper.check(new Integer(73));
錯誤:該方法檢測(?捕獲#6的擴展碼)的類型謂詞是不適用的參數(整數)
我已閱讀:Method in the type Map<String,capture#1-of ? extends Object> is not applicable和Difference between <? super T> and <? extends T> in Java